Read BIP39 then BIP32 then BIP44
Seed is used to generate Master Private Key (and the mnemonic 12/24 words).
Better way to think, convert the entropy to a BIP39 mnemonic. Use that mnemonic plus a (technically optional but no) passphrase as the inputs to produce the BIP39 numeric seed. End of BIP39.
The BIP39 numeric seed is used to derive the extended master private key (aka master xprv or BIP32 root key, corresponds to the root node "m")
That xprv includes the master private key plus the chain code
and from that master xprv is derived every child xprv for a given derivation path in the tree below.
The public key and address are derived from the private key. Only extended keys (with a chain code) can derive children.
Accounts are at level 4, so #7 below
m / purpose' / coin_type' / account' / change / address_index
e.g. m/44'/0'/7'/change/index
Now my question is: Is it possible to have multiple receiving addresses (bc1q) related to the same PHK, thus to the same account?
Thus, no, 1:1 with the keypair
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